| Onalaska to Orbetello | 4,788.38 mi (7,706.16 km) |
| Onalaska to Oria | 5,122.71 mi (8,244.20 km) |
| Onalaska to Oristano | 4,800.11 mi (7,725.03 km) |
| Onalaska to Orta Nova | 5,010.79 mi (8,064.09 km) |
| Onalaska to Orte | 4,832.24 mi (7,776.75 km) |
| Onalaska to Ortona | 4,913.38 mi (7,907.31 km) |
| Onalaska to Orvieto | 4,809.91 mi (7,740.81 km) |
| Onalaska to Orzinuovi | 4,607.26 mi (7,414.67 km) |
| Onalaska to Osimo | 4,826.31 mi (7,767.19 km) |
| Onalaska to Ospitaletto | 4,605.63 mi (7,412.05 km) |
| Onalaska to Ostuni | 5,109.49 mi (8,222.93 km) |
| Onalaska to Ottaviano | 4,987.00 mi (8,025.80 km) |
| Onalaska to Ovada | 4,592.12 mi (7,390.30 km) |
| Onalaska to Ozieri | 4,785.99 mi (7,702.31 km) |
| Onalaska to Paceco | 5,047.16 mi (8,122.62 km) |
